The .gov means itâs official.Federal government websites often end in .gov or .mil. Before sharing sensitive information, make sure youâre on a federal government site. The site is secure.The https:// ensures that you are connecting to the official website and that any information you provide is encrypted and transmitted securely. It's Your Country  Take one minute to protect it. Federal Law requires nearly all male US citizens and male immigrants, 18 through 25, register with Selective Service. The law currently requires that only men register with Selective Service. In the event that the law is changed to include registering women, Selective Service is prepared to expand registration. Call: 847-688-6888 or toll-free: 888-655-1825Hours of operation: 9:00 AM to 5:00 PM EST, Monday to Friday, except on federal holidays.